-9.7% is the change from 299 to 270
Calculation steps:
[( 270 - 299 ) ÷ 299] x 100 = -9.7%
Formula
Percentage change = [(270 - 299) / 299] x 100
Subtract the new number by the original number
270 - 299 = -29
-29 ÷ 299 = -0.09698996655518395
-0.09698996655518395 x 100 = -9.7%